Thanks Gerald. The thing that struck me and drove me to start the thread is how totally crystal clear the working solution ended up being--and smelling. Not a hint of sediment. Like a miracle, because before I stirred the sulphite into the concentrated stock, it had a fair amount of (sulfur?) floating around. And if I tried making a working solution out of it ,the bottom 25% of the working solution would cloud up, and if I filtered it, it would just do it again, and again, till the whole gallon was gone. Now it's like brand new, and smells perfect. I just didn't expect such a drastic change.